374 Notices of Books. [July, 
Crystal Palace. Mr. Lloyd justly places the greatest reliance on 
constant circulation of the sea-water in the tanks; this is 
effected by a steam engine and suitable pump, both in duplicate 
to provide for accidents, capable of forcing from 5000 to 7000 
gallons per hour through the range of tanks. 
Nearly the whole of the pipes, strainers, and other apparatus, 
including the pumps, are made of vulcanite, which has been 
found effectually to resist the action of sea-water, the only 
exception being some of the larger pipes, which are of stone- 
ware. 
Pages 38 to 64 are devoted to a brief and popular, but by 
no means unscientific, account of the various animals kept in the 
tanks. These are arranged according to their classes. Many 
interesting facts relating to the habits of these creatures are 
here given, much of which is derived from the author’s personal 
experience in aquaria both at home and abroad. 
The publication of this little work is a step in the right 
direction, and Mr. Lloyd is to be congratulated on having pro- 
duced a guide quite equal in its own department to the admirable 
ones of the Royal Gardens and Museums at Kew. 
Astronomy and Geology Compared. By Lorp ORMATHWAITE. 
London: John Murray. 1872. 
The Origin of Species by Means of Natural Selection. By 
CHARLES Darwin, M.A., F.R.S., &c. Sixth Edition, with 
Additions and Corrections. Eleventh Thousand. London: 
John Murray. 1872. 
Man in the Past, Present, and Future. From the German of 
Dr. L. Bichner.. By W. S. Dattas, F.L.S. London: 
Asher and Co. 1872. 
Tue title of Lord Ormathwaite’s work is that of the first Essay, 
in which the evidence afforded by Astronomy and Geology are 
compared with the view to ascertain the value of that of the 
latter science. The third Essay treats of progress and civilisa- 
tion. The author’s thoughts are throughout clearly expressed ; 
and there is little need to tell the reader that under the 
affliction of extreme dimness of sight an amanuensis has been 
employed. The second Essay entitled, ‘‘ Remarks on the 
Theories of Mr. Darwin and Mr. Buckle,” gives the points on 
which Lord Ormathwaite is at issue with Mr. Darwin, 
Mr. Buckle receiving but little consideration. Strangely, one of 
the chief objections to Mr. Darwin’s theory is answered by 
an addition to ‘“‘ The Origin of Species” in the present edition, 
both works being published at the same time. We quote the 
reply, because the argument is one often advanced against the 
theory of the mutability of species. ‘But as my conclusions 
have lately been much misrepresented,” says Mr. Darwin, ‘‘ and 
